Glass Breakage Sensor Malfunction
Glass Breakage Sensor Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Circuit/System Description
The glass breakage sensors are located as part of the rear side windows. The rear defogger grid is also utilized as a glass breakage sensor for the vehicle's rear glass. The body control module (BCM) applies B+ to the glass breakage sensor signal circuit when the content theft deterrent system is armed. When the signal circuit is complete, the B+ supplied by the BCM is pulled directly to ground. This indicates that both glass breakage sensors and the rear defogger grid are complete and intact. If any of the vehicle's rear glass is broken in an attempt to gain access to the interior of the vehicle, the signal circuit in the appropriate glass breakage sensor or rear defogger grid will open. This removes the ground path for the B+ signal provided by the BCM and will indicate a theft attempt has occurred. The BCM will then activate the content theft deterrent alarm sequence.
Reference Information
Schematic Reference
Theft Deterrent System Schematics Theft Deterrent System Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Theft Systems Description and Operation Theft Systems
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF, disconnect the X2 harness connector at the E18 rear defogger grid. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohm between the ground circuit terminal A and ground.
• If 10 ohm or greater
1. Ignition OFF.
2. Test for less than 2 ohm in the ground circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, repair the open/high resistance in the ground connection.
• If less than 10 ohm
3. Disconnect the harness connector at the B159L glass breakage sensor - left.
4. Test for infinite resistance between the signal circuit terminal 1 and ground.
• If less than infinite resistance
Repair the short to ground on the circuit.
• If infinite resistance
5. Disconnect the X1 harness connector at the E18 rear defogger grid.
6. Test for less than 2 ohm between the signal circuit terminal 1 at the B159L glass breakage sensor - left harness connector and the signal circuit terminal A at the E18 rear defogger grid harness connector.
• If 2 ohm or greater
Repair the open/high resistance on the circuit.
• If less than 2 ohm
7. Connect the harness connector at the B159L glass breakage sensor - left. Disconnect the harness connector at the B159R glass breakage sensor - right.
8. Test for infinite resistance between the signal circuit terminal 1 and ground.
• If less than infinite resistance
Repair the short to ground on the circuit.
• If infinite resistance
9. Test for less than 2 ohm between the signal circuit terminal 1 at the B159R glass breakage sensor - right harness connector and the signal circuit terminal A at the E18 rear defogger grid harness connector.
• If 2 ohm or greater
Repair the open/high resistance on the circuit.
• If less than 2 ohm
10. Connect the harness connector at the B159R glass breakage sensor - right. Disconnect the X6 harness connector at the K9 body control module.
11. Ignition ON.
12. Test for less than 1 V between the signal circuit terminal 13 and ground.
• If 1 V or greater
Repair the short to voltage on the circuit.
• If less than 1 V
13. Test for infinite resistance between the signal circuit terminal 13 and ground.
• If less than infinite resistance
Repair the short to ground on the circuit.
• If infinite resistance
14. Test for less than 2 ohm between the signal circuit terminal 13 at the K9 body control module X6 harness connector and the signal circuit terminal A at the E18 rear defogger grid harness connector.
• If 2 ohm or greater
Repair the open/high resistance on the circuit.
• If less than 2 ohm
15. Replace the K9 body control module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Control Module References for BCM replacement, setup, and programming